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Thermal Resistance

°F·s/BTUto°F·h/BTU

Convert Fahrenheit-seconds per British thermal unit (°F·s/BTU) to Fahrenheit-hours per British thermal unit (°F·h/BTU).

Factor1 °F·s/BTU = 0.0002777778 °F·h/BTU

Converter

°F·s/BTU

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1°F·h/BTU

Rendered to 6 significant figures.

Formula

Formula
°F·h/BTU = °F·s/BTU × 0.0002777778

Multiply any value in Fahrenheit-seconds per British thermal unit by 0.0002777778 to obtain the value in Fahrenheit-hours per British thermal unit.

Worked example

Convert 3600 °F·s/BTU to °F·h/BTU.

  1. 01Start with 3600 °F·s/BTU.
  2. 02Multiply by the conversion factor: 3600 × 0.0002777778 = 1 °F·h/BTU.
Result3600 °F·s/BTU = 1 °F·h/BTU

Conversion table

°F·s/BTU°F·h/BTU
10.00027778
20.00055556
50.0013889
100.0027778
200.0055556
500.013889
1000.027778
2000.055556
5000.13889
10000.27778

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from °F·s/BTU to °F·h/BTU?
1 °F·s/BTU equals 0.0002777778 °F·h/BTU. To convert, multiply the value in Fahrenheit-seconds per British thermal unit by 0.0002777778.
How do I convert 1 °F·s/BTU to °F·h/BTU?
1 °F·s/BTU = 0.000277778 °F·h/BTU. For any value, multiply by 0.0002777778.
How do I convert °F·h/BTU back to °F·s/BTU?
Divide by the same factor — or equivalently, multiply by 3600. So 1 °F·h/BTU = 3600 °F·s/BTU.
When would I need to convert Fahrenheit-second per British thermal unit to Fahrenheit-hour per British thermal unit?
Thermal-resistance conversions between °F·s/BTU and °F·h/BTU appear in electronics cooling (heat-sink and TIM datasheets), transformer, motor and generator thermal-rise calculations, lumped-element R-C thermal-network modelling, and transient heat-transfer analysis. K/W and °C/W are the SI standard; mK/W and µK/W cover sub-SI heat-sink and TIM datasheet ladders; K/kW and K/MW cover large-equipment and power-plant notation; °F·h/BTU and °F·s/BTU are the US convention. This category is lumped thermal resistance only — it does NOT include area-normalized R-value (m²·K/W), thermal-conductivity inverse with geometry, or U-value calculations, all of which are different physical quantities.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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